Lack of voltage?

Discussion in 'Car Audio, Electronics & Security' started by RXL, May 17, 2011.

  1. RXL

    RXL Member

    93
    0
    Apr 29, 2011
    Ontario
    I have a 76 and wondered if these alternators are up to the task of running amps or is it more likely my grounds.
    The audio sounds ok when the engine isnt running and is ok for about 15 minutes running, then gets a static sound. No whining, but more like a bad radio signal. RCA's run down the opposite side of the car from the speaker wires.
    Only one amp is hooked up right now. It's an alpine 4 channel 100watt rms x4.
    2 guage runs to a distribution block and then 2 4 guage runs to the trunk. Block is at the firewall.
    I posted this in electronics section a few days ago, but things seem pretty slow there. No replies.
    Thanks for any ideas.
     
  2. 70SSRS350

    70SSRS350 Veteran Member

    377
    0
    Jul 30, 2010
    ITALY
    One of my friends had a similar problem many years ago, here in europe...
    Not in a camaro, ok....
    It was a bad ground connection.
    Try putting a wire from the ground of the amplifier to the negative of battery. If it works ok is the bad ground connection.
     
  3. RXL

    RXL Member

    93
    0
    Apr 29, 2011
    Ontario
    Figured I had good ground, but maybe not. I'll have to find some time to mess around it more.
    I dont listen to it much in a 4 gear car anyway, but when I hit the highway it would be nice.
    Everything worked perfectly in the shop over the winter just hooked to a battery. As the battery got low, I got the same sound. Hook up th charger and it was right back to good sound.
    There's a new battery in the car and it's taking a full charge, so ground is where I'll start. Cheaper than an alternator. lol

    Thanks
     
  4. Aceshigh

    Aceshigh Veteran Member Lifetime Gold Member

    26,757
    0
    Apr 9, 2001
    Boondocks
    The GM engineers designed your factory alternator to run the car's electrical needs.
    Not the needs of additional large amp drawing stereo equipment.

    If you're adding on stereo equipment you need to figure out how much more
    juice you need your generator to pump out, to supply enough juice for your amps.

    Sure it will work for awhile, but you're not charging the battery like you're supposed to be.
    Then your battery will take a sh**. That's basically what's going to happen.....

    My suggestion is to just get a CS130 140amp alternator if you're adding one amp.
    If you're adding 2 or more, you'll probably need more then that. Louder it gets, the
    more juice it sucks.
     
    Last edited: May 18, 2011
  5. RXL

    RXL Member

    93
    0
    Apr 29, 2011
    Ontario
    I wont be listening to it often because I like to hear my car, but I have an Alpine m605-400rms x1 and a mrv345 4 channel-75rms x4.
    I've installed many stereo's without any real tech knowledge but this is starting to annoy me. Everything is fine while the vehicle isnt running. 15 minutes into running and it goes for a crap. I swapped the grounds and still have the same issue.
    Is there a junk yard upgrade I can grab for an alternator? Bolt in?
    I have a 3 wire alternator and am looking for a cheap fix as I have other priorities for the car. It's new to me. :happy:

    Also, can I run a 0 guage wire straight to the alternator from power on the battery? Leaving th power to the starter obviously. Will it aid in charging the battery? I did what is referred to as the "big three" on my 93 chevy truck and wondered if there is a simular upgrade for the Camaro
     
  6. BondoSpecial

    BondoSpecial Veteran Member Lifetime Gold Member

    8,699
    0
    Sep 20, 2004
    Southern Maryland
    yeah a third gen 105 amp alt is a bolt in, from a pre-serpentine belt car (pre 1988 I think). you just swap out the multi rib pulley for your v belt pulley and wire it accordingly for a CS series upgrade
     
  7. RXL

    RXL Member

    93
    0
    Apr 29, 2011
    Ontario
    Got it, thanks.
    Full size trucks have them too?
    I'm sure they would. I'll know when I hit the bone yard. Need some A pillar trim too, so it's an excuse to go for a stroll.

    Appreciate the input fellas. :cool:
     
  8. Aceshigh

    Aceshigh Veteran Member Lifetime Gold Member

    26,757
    0
    Apr 9, 2001
    Boondocks
    Yes. I think the newer GM trucks use CS-144's though, and they are big
    AMP Generators. The LY6 one I got is 160amp from the factory.

    I think someone else told me they go up to 200amp, but not sure if that's true
    or what models to find them on.
     
  9. RXL

    RXL Member

    93
    0
    Apr 29, 2011
    Ontario
    Do you happen to know off the top of your head if it's the same wiring configuration for these big amp alternators?
    I can build a motor, but I cant wire a set of tail lights. lol
     
  10. Aceshigh

    Aceshigh Veteran Member Lifetime Gold Member

    26,757
    0
    Apr 9, 2001
    Boondocks
    It's just 2-3 wires on a modern alternator.

    Frankly IMO it's the best way to break the ice for a wiring newbie.
    It's so simple that when you're done it will give you more confidence. :bowtie:

    Just get the biggest you can that matches your pulley setup and mounts correctly.
    Then come here and ask about the pigtail wiring, and we can help.

    Ricardo just posted a pigtail site that I rehosted in the High Tech Retrofits sticky.
    http://www.qualitypowerauto.com/catalog.php?item=81
     

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